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Molecular Gas Dynamics in Spiral Arms of M51

  • Nario Kuno (a1), Naomasa Nakai (a2), Toshihiro Handa (a3) and Yoshiaki Sofue (a3)

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We present the kinematics and dynamics of molecular gas in the almost entire disk (>5′×5') of the grand-design spiral galaxy M51, derived from CO(J=1−0) observations with the Nobeyama 45-m telescope. The spatial resolution of 17″, which corresponds to 790pc at the distance of M51 (9.6 Mpc), is enough to distinguish between a spiral arm and an interarm; therefore a clear spiral structure (cf Nakai et al, this conference) and large streaming motions of the molecular gas were revealed.

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References

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Roberts, W. W. (1969) Astrophys. J. 158, 123
Hausman, M. A., Roberts, W. W. (1984) Astrophys. J. 282, 106

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